Pool & Spa

Volume, chemicals, heating, and covers — sized from your pool's real dimensions, with the math shown.

16 calculators
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Pool volumeGallons for rectangle, oval, round, or kidney shapesMOST USED →Chlorine doseShock and maintenance doses from gallons and current ppmOPEN →Heater sizingBTU input from volume, temperature rise, and seasonOPEN →
All Pool & Spa calculators
Pool volumeGallons for rectangle, oval, round, or kidney shapesChlorine doseShock and maintenance doses from gallons and current ppmHeater sizingBTU input from volume, temperature rise, and seasonSalt system dosingPounds of salt to reach target ppmPump run timeHours per day for one full turnoverPool shockpH adjustmentAlkalinity doseCalcium hardnessStabilizer (CYA) doseFilter sizingEvaporation lossPool build costResurfacing costHot tub / spa dosingWinterizing amounts
Chemical doses are from published product concentrations — follow the product label and retest after dosing.